Object spread operator can be used to clone an object or merge objects into one. The spread operator (…) spreads the elements of an iterable like array or string in Javascript. The spread operator is simply three dots and it is … The core piece to know is the ... syntax. JavaScript spread operator is one of the more popular features that were introduced in ES6. This tutorial will help you understand it. Some scenarios where this capability is useful include: Adding array elements to an existing array This is yet another popular way to copy an array in Javascript. You will also learn how to use it to copy and merge arrays and object literals, insert data and more. You will learn what spread operator is and how it works. Specifically: arrays, objects literals, and strings. The spread operator is widely used throughout JavaScript. JavaScript & The spread operator. The operator’s shape … Spread Operators for Arrays. This is the most succinct and immutable way that I've found. The syntax for the spread operator is three dots, followed by the iterable object which you want to access. spread operators however, let us unpack elements in an array to single/individual arguments. Following is the code for spread operator in function calls in JavaScript − Code language: JavaScript (javascript) Summary. With a major update in ES9, the spread operator is now extended to objects in addition to arrays. It makes it easy to copy iterable objects, add items to a new iterable, and pass arguments to a function. It is mostly used in the variable array where there is more than 1 value is expected. Using Slice. The spread operator allows us to expand elements. When merging objects, the spread operator defines new properties while the Object.assign() assigns them. The spread operator is a feature of JavaScript introduced with ES6 that gives you access to the insides of an iterable object. Spread operator allows an inerrable to expand in places where 0+ arguments are expected. Copy. The term “iterable object” is really just a computer science-y term for a category of data types. There are two features in particular that I'll be covering in this post: spread operator; rest parameter; Spread Operator. This is the spread operator, and it essentially takes either an array or an object and expands it into its set of items. The spread syntax allows us to spread an array or any iterable to be expanded across zero or more arguments in a function call. Object spread operator (...) unpacks the own enumerable properties of an object. In this article, we'll talk about the spread operator… The cloning is always shallow. Boring stuff out of the way, let’s look at a bunch of examples to better understand what in the heck the spread operator … Spread operators. The spread operator allows an expression to be expanded in places where multiple elements/variables/arguments are expected. The spread operator came out in ES6 and has great functionality for arrays in JavaScript. 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